Stephanie, thankyou, I will check that link out. I was looking today if there
was a homebrew filter I could make for these I have in the garage. I decided
to keep four because they are supposed to be good to -20 degrees, but they are
noisy. I’ll see if I can make a filter for one and if it works then I’ll do
all four.
I think the LED’s do have a so called ballast as it’s a conversion to the LED
requiremen, but not the same as a ballast for flouresent lighting which are
heavy and generate heat.
73
Dale, K9VUJ
On 13, Jun 2018, at 14:48, Stephanie WX3K via RFI <rfi@contesting.com> wrote:
Here is a helpful link
https://www.digikey.se/Web%20Export/Supplier%20Content/Lambda_285/PDF/TDKLambda_all_about_emi_epmag.pdf
If you search Amazon by entering EMI filter you will find a variety for
different applications.
Of course you need to determine how the RFI is being picked up by your antenna.
This is key in suppressing the noise source. Perhaps even several wraps thru an
appropriate torroid core might even help you too.
Ballasts or not, An EMI filter mounted on the light housing would be the most
effective i believe assuming the offending circuit is not in a wall wart. If a
switching supply in a wall wart is the noise source, you would be to insert
filtering some other way.
Stephanie
> On Jun 10, 2018, at 7:15 AM, Dale Johnson <dj2001x@comcast.net> wrote:
>
> I don’t believe LED shop lights have a ballast.
>
> I am not sure if the noise is in the power line or is being radiated
> directly. I took my portable SW radio out there and it picked up the noise
> very nicely. Of course the line cord could be the antenna too.
>
> Do you recommend any particular filters? I should try one and see if it
> helps then if it does I would install on the other three. Sure is nice
> lighting, makes my shop really light up.
>
> tnx
> Dale, K9VUJ
>
>
>
> On 09, Jun 2018, at 20:39, Stephanie WX3K via RFI <rfi@contesting.com> wrote:
>
> Install EMI filters on the lights. Most of the ballasts these days are noisy.
> I had an issue on 6 meters until i installed EMI filters inline.
>
> A typical filter costs about $10-15
>
> Stephanie
>
>> On Jun 9, 2018, at 2:12 PM, Dave Cole (NK7Z) <dave@nk7z.net> wrote:
>>
>> If you have a screen capture of the RFI, using an SDR, or P3, could you send
>> it to me please? I would like to add it to the ever growing RFI snapshots
>> web page I have.
>>
>> 73s and thanks,
>> Dave
>> NK7Z
>> https://www.nk7z.net
>>
>>> On 06/09/2018 11:01 AM, Dale Johnson wrote:
>>> I found some nice shop lights for under $20 so I purchased 4 for the garage
>>> shop. After installing them I found lots of noise on 20 meters with peaks
>>> and valleys, to make sure the new shop lights were the culprit I turned
>>> them off and then the 20 meter band was quiet again. These are Smart
>>> Electrican brand, model number LSL3300L42WH. These are distributed by
>>> Menard, Inc. Eau Claire Wisconsin. Made in China. I purchased a couple
>>> more for my basement shop, but I’m going to return those.
>>> Anybody know of a quiet brand of LED shop lights?
>>> Tnx 73
>>> Dale, K9VUJ
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
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